Add bounty test to test against checkInvarient

test/Bounty.js

@@ -0,0 +1,14 @@
+contract('Bounty', function(accounts) {
+  it.only("create target", function(done){
+    var bounty = Bounty.deployed();
+
+    bounty.createTarget().
+      then(function() {
+        return bounty.checkInvarient.call()
+      }).
+      then(function(result) {
+        assert.isTrue(result);
+      }).
+      then(done);
+  })
+});